VCI-400 SE New Firmware mismatch!ERROR! no ACK still in bootloader mode! help!!!Pls!!

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Well, resolved the problem...for everyone who wanna know it:
make a factory reset in org. vestax firmware tool in OSX, after that load up org. vestax firmware v2.0 (standalone mixer update)...at the end get firmware updater from techtools for upgrading to techtools vci 400 se v2.0 (with PC only)...
...connect with my make loading up .tsi for Traktor 2.6 Done!Works fine until now

I had the same problem "ERROR!! ACK is not found". Unfortunately, doing the factory reset on MacOSX and installing the standalone mixer firmware did not fix my VCI. It's still stuck in bootloader mode! Can you explain more clearly how you were able to do the DJTT v2 update at the end of the standalone mixer update?

I followed FlashFlooder's Advice and persevered with it and finally got it to work.

For me the way I fixed it was the following

1) Powered off my VCI400 and left it powered down for a few minutes.
2) Restarted my PC.
3) Connected my VCI400 via the USB Cable - But did not power it up.
4) Opened the FirmUP.exe and left it open.
5) Started the VCI400 in Bootloader Mode
6) Tried to flash and in this case it was successful.

Okay, after hours of trying different scenarios this is what finally worked for me:
1) Restart PC
2) Turn VCI-400 on in bootloader mode
3) Open FirmUp and attempt update
4) Update fails and gives the ACK error
5) Leave Firmup open
6) Turn off VCI-400 and turn it back on in bootloader mode
7) Without changing the previous Firmup settings, press Start again.
Wow what a pain!

Okay, after hours of trying different scenarios this is what finally worked for me:
1) Restart PC
2) Turn VCI-400 on in bootloader mode
3) Open FirmUp and attempt update
4) Update fails and gives the ACK error
5) Leave Firmup open
6) Turn off VCI-400 and turn it back on in bootloader mode
7) Without changing the previous Firmup settings, press Start again.
Wow what a pain!

On fifth time of reboot (when i started to panic) this works!
Many thanks!!!

p.s. "Dj techtools guys", you REALLY need to do something with this flashing process...